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                [Hnoi2016]序列                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><p>　　给定长度为n的序列：a1,a2,&hellip;,an，记为a[1:n]。类似地，a[l:r]（1&le;l&le;r&le;N）是指序列：a<sub>l</sub>,a<sub>l+1</sub>,&hellip;,a<sub>r-<br />
1</sub>,a<sub>r</sub>。若1&le;l&le;s&le;t&le;r&le;n，则称a[s:t]是a[l:r]的子序列。现在有q个询问，每个询问给定两个数l和r，1&le;l&le;r<br />
&le;n，求a[l:r]的不同子序列的最小值之和。例如，给定序列5,2,4,1,3，询问给定的两个数为1和3，那么a[1:3]有<br />
6个子序列a[1:1],a[2:2],a[3:3],a[1:2],a[2:3],a[1:3]，这6个子序列的最小值之和为5+2+4+2+2+2=17。</p></p><hr/><h3>输入格式</h3><p><p>　　输入文件的第一行包含两个整数n和q，分别代表序列长度和询问数。接下来一行，包含n个整数，以空格隔开<br />
,第i个整数为ai，即序列第i个元素的值。接下来q行，每行包含两个整数l和r，代表一次询问。</p></p><hr/><h3>输出格式</h3><p><p>　　对于每次询问，输出一行，代表询问的答案。</p></p><hr/><h3>样例输入</h3><pre>5 5 
5 2 4 1 3 
1 5 
1 3 
2 4 
3 5 
2 5 </pre><hr/><h3>样例输出</h3><pre>28 
17 
11 
11 
17 </pre><hr/><h3>提示</h3><p><p>1 &le;N,Q &le; 100000,|Ai| &le; 10^9</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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